Electric-motor control.



C; S. JENNINGS.

ELECTRIC MOTOR CONTROL.

APPLICATION FILED JUNE I7, 191 x.-

UNITED STATES PATENT OFFICE:

cimsriza s. innzumes, or nos'ron, mnssncnusn'r'rs; .assmivoa .2150 THE LAMSON 1 company, ronmEaLY LAMSON CONSOLIDATED s'roan SERVICE content or BOSTON, MASSACHUSETTS, A COBIOBATION OF NEW JERSEY.

ELECTRIC-MOTOR CONTROL.

Specifi a on Letters ratent- Patented Apr. '27, 1915.

Application filed June 17, 1911. Serial No. 633,649

for transmitting carriers, or substance through apneumatic tube system reliably and in a predetermined time, the primary I actuating means being located at a distance from" the said control. performed by. this control are to start. the

Thefunctions to be motor and by suitable-means connecting it i with a pump, or exhauster'to begin to generate a fluid force and continue in opera- .tion the production of this forcexa'prede- V tel-mined time, sufiicientto eifect the trans, missionof a carrier or' the proper quantity of a, substanee,,to reset the timing mechanism so that the. duration of the operation I is exacted during the interval of" the initial will be exactly the same if a secondary effect tlming or any subsequent interval of timing and finally to.cause the-motor to stop and.

' arrest the generation of the fluid 'force."

Another object of my invention is to provide acontrol-for an electric motor whenused to drive a pump or exhauster' operativ'ely connected to pneumatic tube transmission system that will permitof the motor being started from a distant point, timing its duration of operation uniformly even" if the primary actuating contact be rapidly made and broken. In other words,

1f'the duration ofthe 40 primary actuating contact be less'than the time required to energize the. timing solenoid} and thereby cause its armature to ,'-fail to; complete its.

tull movement, means'is provided to e'fiect the full movement of 'the lar'niature independent of the primaryi factuatingg contact;

' t i g otor tofoperatefor the time predetermined.

Like letters of reference refer to like parts throughout the several views. p

In the drawings Figure 1 represents, a plan view of a panel on which the controlling mechanism is mounted showingv the necessary wiring connections. -Fig; 2 is a vertical detail section taken on line IIII.

of Fig. 1.'

" P is a primary actuating solenoid whose 'leads are P and P and whose armature Pi carries the contact plates P 'and P insulated from each other and from the armature P, contact plate I" being adapted to engage contactposts P and P and contact plate P to engage contact post P and P.

T is a timing solenoid the-leads of which are T and T and whosearmature is T and' which carries the flexibly mounted con-. tact" plate T which is insulated from the armature .and is'elastically held against the flange T which is aflixed to the armature T and which is adapted to come in contact with the contact postsE and '13 when the armature is attracted upward. Aifixed to the armature T is a-member T projecting inward and upward toward the panel and adapted to engage the switch arm X and. open the circuit closed b theswitch X which completes a circuit etween the contact posts X and X Garried on the upper 1 end of the armature T is the timing cylinder D in which is fitted a piston D attached to the piston rod D which is aflixed'to the pivot D mounted on the panel. The lower main or lower portion of the piston rod D is tubular and contains a metal ball D' adapted to close the opening in the lower end of said rod, the 'lower'end of the tubular opening of the piston rod D being con- 'tracted to form a seat for this ball valve. A small hole Diconnectingthe tubular-portion of the piston rod 1) with the space, abovethe piston D, and a hole D' in the rod D completes a passage controlled by the ball valve) between the space above and below the piston; thus permitting .the c lin-k der '1) carried onthe-armature .T o' the contacts X and X, wires P and P back leads and (I is a battery, dynamo, or other source of current of low voltage for the push button circuit. This button or circiiit maker has been designated A and when actuated completes the following circuit: From battery G current flows over wire A to solenoid I, thence back over wire B'to the push but ton A and from thence via wires P and P back to the battery. The armatureP ot' the energized solenoid P carries its contact plates P and P up into contact with posts P P P and P completing the following circuit: From battery via wire A,

solenoid P, wire B to wire Q, post P plate P post P wire P switch arm X, switch to battery. This constitutes a maintaining circuit for solenoid P when the push button is released and hence plates P and I? remain in contact with their respective posts, which assures the complete upward movement of the armature T of the solenoid T, the latter being energized by the following circuit: Lead M from a high potential generator, ,fuse R, wire R main line switch Gr,

wires M and lit to solenoid post T thence via solenoid T to post T wire M post P,

plate P post P, wire M main line switch (3:, wire R fuse R and lead M back to the" generator. -The upward movementof the armature T of the energized solenoid T brings its yieldingly mounted contact plate T into engagement with contact posts E and E and .completes a circuit through the motor-starting solenoid S as follows :Lead M from the generator, fuse R, switch G, wire M wire V, post'E, plate T post E, wire M post S solenoid S, post S wire M switch G, wire R fuse R lead M, back to the.generator. Plate T and solenoid S are hence' in parallel with plate P and solenoid T. The armature S of the energized solenoid S, rises until its laminated contact S closes the gapin the motor circuit between contact posts S and S, current flowing at such time from generator lead M through R R switch G, M motor lead M or motor M, lead M post C", contact S, post 3, wire M switch G, R", R, to generator main. M, causing the motor to operate. The armature T? has affixed to it a menib'er T which continues to "1 and the maintaining circuit which has already been opened by the switch X. -The;

solenoid T now being deene rgijzed permits its armature T which on rries the timing cylinder D'todescend at a speed which is pre-- determined by the admission of air to the cylinder D through the orifice controlled by the timing screw D"; .As the member T decends the e the switch X to reengage its contact X thus closing the maintaining circuit at this point, but, as'has already been shown, this maintaining circuit has previously been broken at contact posts P and P owing to the descent of the armature P so that the solenoid T ver T is lowered, permitting will. not be reenergized unless the- 'ri'mary or push button circuit is again close If, however, the push button or primary circuit'is not closed and the armature T is allowed .to 7

complete its descent, the motor will be stopped owing to the circuit which main-.

tains energized the motor starting solenoid 5 being broken when the contactcplate T is forced out of engagement with contact posts E and El by the flange T. It will readily be seen that if, the push button circuit was closed prior to the completedescent of the armature T a completecycle of the timing operation would nevertheless takeplace the movement of the armature of the motor sole- 7 only feature not alfected "being the upward noid S -which-would already be inits upper-f i most position. In other words,-the mocha nism is adapted to be retirn'ed without interfering with the motor circuit.

Having thus described myinventiori, what i i I claim, and desire to secure by Letters Pat.-

ent of the United States is: i

1.. In a control for an electricmotor, elec trically actuated meansfor starting the mo tor from a distant point, means unaffected by the power generated by the motorfortiming the duration of the operation of the motor when started, .said timing means adapted to be re-set to extend :the operation of said motor uninterruptedly at any time during the period of operation of the same and means for insuring settingof said timing means to time-for a full period whenever said first mentioned means is actuated.

2. In a control ,for an electric motor, electrically actuated means for starting the motor from a distant point, pneumatic means unaffected by the power generated by the vision's for maintaining said conditions when established, means controlledby said circuit for enabling the operation of said motor by motor for timing the duration of the operation of the motor when started, said timing means adafpted to be-re-set ,to extend .the'operation 0 said motor" uninterruptedly at any time during the periodof operation'of the same and =means 'for insuring a setting ofsaid'timingmeans to time for a full pellOd whenever said first mentioned means is actuated.

3. In a control-for an electric motona controlhn circuit having provisions for temporal-i y establishing motor-starting cur'-- rent conditions'threin andseparate proelectric current only .sojlong as'said condi tions remain established, and means, operat- 4.v In combination, an electric motor having a circuit, a controlling circuitindep'end ent of the motor circuit and operating at a lower potential than said motor, said con:

. lished,-means, controlled 'bysaid'controlling circuit and including an electro-magnetic trolling'circuit having provisionsfor tem-.

porarily establishing motor-starting current conditions therein and separate provisions- 4 motor controlling circuit inchiding'an elecfor maintaining said conditions when estabdevice operating at a'hi her potential than said circuit, for di sestab ishing said condi-, tions while "enabling the ;o eration of said motorcby electric 'current' or, a determined. period running-from: the disestablishment of said conditions, and'meansfortiming the duration of said' period whereby to automatically limitthe operation of said-motor.

-5. In a control for, an electric motor, a motor controllingc'ircfiit including an electro-magnetic device having a part'movable into and outof a positio in whichwit isf .adaptedto render the mo I r operative, provisions for maintaining said part'in its.

motor operating position when :once dis-- posed-therein, a'second electric circuit domi- I nated byrsaid device and including a second electro=magnetic motor' 'controll-ing device,

' means contrclled'by said second devicefor operation of said motor to. a

rendering the provisions aforesaid inoperative, and means for timing a movement ofsaid second device to normally limit. the period determined by said timing means.

-6.' In' a; control for anielectric'inotor, a.

, motor controlling circuit including an -elect O-magnetic device, having a part movable nto andout of a position in which it is visions for maintaimngsaid part .in--i ts motor operating posi-tion when once d s- 'visions for maintaining said part in its posed therein, a: second electric circuit dom inated by said device and including a'second devices aforesaid, for insuring-thatIsaid for timing the duration of said'period whereby to normally limit the operation of-said dapt'ed tdrender themotor operative, pro-- tive only', after a partof said second device has been moved a determined distance, said part havinga tendency .for a-second determined movement thereafter, means to time said second movement, and a motor-starting-switch controlled by one-of thedevices aforesaid. it

'7. In a control for an' electricmotor, a motor controlling circuit including an elec-' tro-magnetic devicehaving' a part movable into and out of a position in which it is adapted tov render the motor operative, promotor, operating position when: once disposed therein, a second electric circuit dom1-- nated' by said device and including'a second j electro-mag-neti'c' 'motor-controllin -device, -.85 means, controlled by said'second evice for rendering the provisions aforesaid inoperar tive, means for timing a movement of said second device, and an electrically operated motor-startin'-. switch having a circuit directly control ed by saidseconddevice.

8.?In a control" for an electric motor, a

tro-magnetic device having a part movable into and out of a position in which '-'1t'.1s

visions for maintaining said part its motor operating position when -onc'e,dis'

loo lcctro-magnetic motor controlling device, means controlled by said second devlce for renderin the provisions aforesaid ino erative, an means, controlled bybne o the motor shall continue to operate for a'deter/ mined period of time subsequent to the 1 -en;/

dering' inoperative of saidinfovisionsi I v 9. In 'a'fcontrol for an electric motor,. a" controlling circuit, independent of the i'notor'lm circuit, having means for temporarily "establishing motor-startingcurrent conditions therein and separate provisions for main? tainin'g said conditions, when established, independently .of a refoperationof saidmeans, means, controlled by sa id controllin circuit for enabling the 'o eration of 'sai motor by electric. currentorfla determined: period longerthan thatduri'ng' which said conditions remain established,- and means motor, said timing means adapted to be I retimed at any timeduring said:period.by' p a 'rekactuation of said firstmentioned means, so that the'motor will invariably beoperated for thafull period after every actuatio i of said condition establishingmeans.

I 10. In" mcontrol for an electric mofio'r, a

primary controlling circuit including an electrormagnetic device and having pro'- visibns'; for maintaining said. device operative when once energized, a secondary electric circuit dominated by said device and inciuding a second electre-magnetic dviw,

said. secondary electric circuit; hav'iln'g'two' branches in one of which is said second device and in theother of which is an electri- ,cally operated motor controlli-ng gw itch, and

'ergi'zation thereof.

.two subscribing miwme I 'means for automatically 'deiinergizing th second of said devices after the lapse of a '1 5 determined interx'a lusubsequent'to the en-- a n t esti'mcny whereof, I have sighed my name tc this-specificaticn in the presence of I Witnesses thiSJQth day of 20 June',,A-.'D. 191 1.n

CHESTER 5. JENNINGS. Witnesses: I 'l M. G.- MAcMnJIgAn,- A E.' M. WRIGHT. 

